This is a new pair of dyna 3 ohm mini series coils. they are compatible with oem ignition systems and the dyna 2000, not the dyna s type ignitions. they are particularly usefull where space is at a premium, being smaller than the regular dyna coils.. they nee either dyna leads and caps or taylor ignition wies and caps. see our other listings for the full range of dyna and taylor products .